SO.... I wonder how this will work with original mags. The new mags have a slightly modified follower that appears longer in the back, so the stop can be tripped when the follower moves up after the last round. Not sure how these would work with original mags?

Also, I wonder when will we see the conversion parts. Rusmilitary says they are coming soon.

Yes, same basic idea. The bolt locking lever is reshaped to support it, and the plunger sits in that area at the center support. There are some pics on the rusmilitary site, and I have a pic of the VEPR bolt stop which is basically the same:

The button on the outside appears to be for a manual hold-open; I suppose that would be easier than the one in the trigger guard.

Yeah I have one on the way... I will take pictures when It shows up. The other thing to note for Washington state is that the import markings are moved from the right rear of the receiver so I can legally convert this to a Russian Side folder. Washington frowns on any modification of the import markings or serial numbers.
Pat

Yes I think I posted about the mag changes on a different thread. I think you can file that middle section of the rear "rib" of the magazine to make the new follower work. Can't wait for mine to arrive